its a 20+ yr old jd 7200. i came to it in maine sitting in the barn under regular use untiol it gets cold. got told by owner its a "bear to start in the cold" has glowplugs but wont start under 40 degrees. Now knowing the owner the plugs prolly have never been changed the plugs. so he uses ether in a short burst to get it going. but when u crank it over it grind and clanks on the starter. whats going on and what should i do before the tractor dies.